EP1569554B1 - Procede destine a determiner la position du point articulaire d'une articulation - Google Patents

Procede destine a determiner la position du point articulaire d'une articulation Download PDF

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EP1569554B1
EP1569554B1 EP03767715A EP03767715A EP1569554B1 EP 1569554 B1 EP1569554 B1 EP 1569554B1 EP 03767715 A EP03767715 A EP 03767715A EP 03767715 A EP03767715 A EP 03767715A EP 1569554 B1 EP1569554 B1 EP 1569554B1
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Prior art keywords
point
articular
joint
tibia
positions
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German (de)
English (en)
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EP1569554A1 (fr
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Francois Leitner
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Aesculap AG
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Aesculap AG
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/45—For evaluating or diagnosing the musculoskeletal system or teeth
    • A61B5/4528—Joints
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B34/00—Computer-aided surgery; Manipulators or robots specially adapted for use in surgery
    • A61B34/20—Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/103—Measuring devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B34/00—Computer-aided surgery; Manipulators or robots specially adapted for use in surgery
    • A61B34/10—Computer-aided planning, simulation or modelling of surgical operations
    • A61B2034/101—Computer-aided simulation of surgical operations
    • A61B2034/105—Modelling of the patient, e.g. for ligaments or bones
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B34/00—Computer-aided surgery; Manipulators or robots specially adapted for use in surgery
    • A61B34/20—Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis
    • A61B2034/2046—Tracking techniques
    • A61B2034/2055—Optical tracking systems
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B34/00—Computer-aided surgery; Manipulators or robots specially adapted for use in surgery
    • A61B34/20—Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis
    • A61B2034/2068—Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis using pointers, e.g. pointers having reference marks for determining coordinates of body points
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B34/00—Computer-aided surgery; Manipulators or robots specially adapted for use in surgery
    • A61B34/20—Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis
    • A61B2034/2072—Reference field transducer attached to an instrument or patient
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
    • A61B90/39—Markers, e.g. radio-opaque or breast lesions markers
    • A61B2090/3937—Visible markers
    • A61B2090/3945—Active visible markers, e.g. light emitting diodes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
    • A61B5/6813—Specially adapted to be attached to a specific body part
    • A61B5/6828—Leg
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
    • A61B5/683—Means for maintaining contact with the body
    • A61B5/6831—Straps, bands or harnesses

Definitions

  • the invention concerns a method for the pre-operative determination of the position of the articular point of a joint and specifically a knee joint.
  • knee deformities such as genu valgum (knock knee) and genu varum (bowleg) by osteotomy
  • the articular point represents an imaginary joint center about which the bones connected at the joint rotate. More precision in the knowledge of the articular point of a joint results in longer lasting replacement joints and more effective correction of deformities.
  • markers attached to bones on opposite sides of the joint connecting the bones are observable by a stereoscopic camera system connected to a data processing system such as a computer that can record the positions of the markers in space and, using software, calculate the kinematic motion of the bones, as well as other mathematical parameters and relationships.
  • the markers attached to the bones establish a coordinate reference system relative to each bone. Additional camera observable markers are freely moveable and may be used to palpate (touch) specific landmarks on the bones in order to ascertain the position of the landmarks in the coordinate reference systems of the bones.
  • the positions of such landmarks are used by the data processing system software, along with the relative motion of the bones connected at the joint of interest, to calculate the geometric and kinematic relationships needed to guide the orthopaedic surgery. Included among these parameters are articular points or joint centers.
  • Present methods for determining the position of articular points require that the knee joint be surgically opened to provide access to the anatomical center of the knee (a landmark point on the femur) so that this point may be palpated by a movable marker to establish its precise location in space relative to the femur coordinate reference system defined by the marker attached to the femur.
  • the data processing system software can calculate a relatively accurate position of the knee center in the femur and tibia coordinate systems. The position of the knee center is then used to provide further information directing the placement of endoprostheses or guiding the bone cutting in an osteotomy.
  • the patent publication DE 196 32 273 A describes a method of determining the position of an articular point of a central joint between two substantially rigid bodies, the central joint being located between first and second outer joints located at the ends of said first and second rigid bodies distal to said central body, respectively, said method comprising the steps of:
  • the invention concerns a method for determining the position of an articular point of a central joint between two substantially rigid bodies, the central joint being located between first and second outer joints located at the ends of the first and second rigid bodies distal to the central joint.
  • the steps of the method include identifying the position of a first point on the first rigid body located substantially at the central joint.
  • the position of a first articular point of the first rigid body at the first outer joint is determined.
  • a first axis between the first articular point and the first point previously determined is defined.
  • the respective positions of a second and a third point on the first rigid body on opposite sides of the central joint are identified.
  • a plane, substantially perpendicular to the first axis and at substantially equal respective rectangular distances to the second and third points is defined.
  • the intersection of the plane and the first axis is used as an initial estimate of the articular point of the central joint.
  • the position of a second articular point of the second rigid body at the second outer joint is determined.
  • a region in the plane having a predetermined size is identified, the region including the initial estimate of the articular point of the central joint as well as other points.
  • the second articular point is then moved relatively to the first rigid body by rotating the second rigid body about the central joint.
  • a multiplicity of different positions of the second articular point are identified during the rotation of the second rigid body.
  • One point among a multiplicity of points within the region is identified for which the position is substantially invariant for each of the positions of the second articular point, the one point being the articular point of the central joint.
  • the method according to the invention is specifically applicable to determining the position of the articular point of the knee joint (the knee center) between the femur and the tibia.
  • Important landmarks on the knee joint for determining the articular point position include the patella (knee cap) and the medial and lateral epicondyles (the eminences of the femur above the knee joint).
  • the method of determining the position of the knee articular point according to the invention comprises identifying the position of the patella and determining the position of the articular point of the femur at the hip joint. This information is then used to define a femoral axis that extends between the femur articular point and the patella.
  • a plane is defined that is substantially perpendicular to the femoral axis and at substantially equal respective rectangular distances to the positions of the medial and lateral epicondyles.
  • the intersection of the plane and the femoral axis is the initial estimate of the articular point of the knee joint.
  • a region in the plane having a predetermined size is defined.
  • the region includes the initial estimate of the articular point position of the knee joint and is preferably a circle centered on this point.
  • the position of an articular point of the tibia at the ankle joint is then defined and this point is moved relatively to the femur by rotating the tibia about the knee joint while recording multiple positions of the tibia articular point during the rotation.
  • the one point within the aforementioned region containing the knee articular point is identified as the knee articular point whose position is substantially invariant for each of the positions of the tibia articular point.
  • the substantially invariant point is defined by a point within the region having the smallest standard deviation of distance between that point and the tibia articular point for all of the recorded positions of the tibia articular point.
  • the step of determining the position of the femur articular point comprises the steps of moving the patella by rotating the femur about the hip joint, identifying a plurality of positions of the patella during the motion of the patella about the hip joint and then determining mathematically a common point at the hip joint having substantially the same distance to all of the positions of the patella.
  • the common point is the femur articular point.
  • the step of determining the position of the tibia articular point at the ankle comprises the steps of identifying the respective positions of medial and lateral malleoli (protuberances) on opposite sides of the ankle joint and the position of an anterior point of the ankle located in the sagittal plane of the tibia. Using this positional information, a first line between the medial and lateral malleoli is defined and a second line is projected from the anterior point to perpendicularly intersect the first line at an intersection point. The tibia articular point is determined as the intersection point of these two lines.
  • Figure 1 illustrates a type of orthopaedic surgical navigation device 10 preferably used to execute the steps of the method of determining the position of the knee articular point according to the invention, it being understood that the method is not limited to any particular device or any particular joint.
  • Navigation device 10 comprises a stereoscopic sensor system 12 having sensors such as cameras 14 and 16 separated from one another so as to view markers 18 and 20 from different locations, thus allowing the positions of the markers in space to be deduced by techniques such as triangulation based upon comparison of the arrival times of signals from the markers at the different cameras.
  • the cameras 14 and 16 are sensitive to infrared radiation so as to be usable in ambient visible light.
  • the cameras 14 and 16 generate signals describing the detected positions of markers 18 and 20, the signals being fed to a data processing system 22, preferably comprising a microprocessor with resident software.
  • the software is written to understand the camera signals and identify the positions of the markers which can then be stored and mathematically manipulated as needed to calculate or deduce further information.
  • Information from the software is communicated to a user of the system by means of a computer monitor 24, and the user communicates with the software by means of a keyboard 26 and foot pedals 27.
  • Markers 18 and 20 are attachable to the leg 28 of a patient on each side of the knee joint 30, the articular point of which is to be determined.
  • One marker, 18, is attached to the upper leg portion 32 which includes the femur 34, the other marker, 20, is attached to the lower leg portion 36 which includes the tibia 38.
  • the markers are preferably attached by means of respective harnesses 40 that prevent each marker from shifting in position on the leg once attached. Harnesses 40 allow the markers to be attached without the use of invasive surgery, thus fulfilling one of the objects of the invention.
  • the markers may also be attached directly to the femur and tibia using bone screws if the bone is surgically exposed.
  • the markers be securely attached to the leg portions so that they always indicate the true locations of the leg portions and not a shift in the marker location relative to the leg. This ensures that any calculations based upon the locations of the markers will be meaningful with respect to the actual leg locations.
  • a movable marker 42 is not attached to any part of the leg but is variably positionable at any point along the leg.
  • Marker 42 is attached to a pointer 44, having a tip 46.
  • the position of the tip 46 relative to the marker 42 is known to the software so that positioning the tip 46 at a landmark on the leg 28 (known as "palpating" the landmark) allows the software to precisely identify the position of the landmark relative to the position of the fixed markers 18 and 20.
  • Such relative positional information is useful for calculating parameters needed to determine the position of the knee articular point as described below.
  • Markers 18, 20 and 42 emit infrared radiation visible to the cameras 14 and 16 allowing them to see and track the relative positions and motions of the bodies to which the markers 18 and 20 are attached or that marker 42 is palpating.
  • the markers may have active emitters that generate their own infrared radiation, or passive emitters that reflect infrared radiation from an infrared radiation source associated with the navigation device 10.
  • the locations of the markers 18 and 20 are identified to the software of the data processing system 22 by the sensor system 12.
  • the marker locations establish frames of reference 48 and 50 on the femur 34 and tibia 38 respectively.
  • the locations of landmarks on the leg 28 as well as the relative motion of the landmarks and the relative motion of the femur and tibia may be identified within the frames of reference.
  • a method of determining the position of the articular point of the knee joint (also called the "knee center") is described below.
  • the method is not limited to the knee joint but may be used on any joint connecting two rigid bodies.
  • the method according to the invention first requires that marker 18 be attached to the upper leg portion 32 which includes the femur 34.
  • Marker 20 is attached to lower leg portion 36 which includes the tibia 38.
  • markers 18 and 20 are viewed by cameras 14 and 16 and defined to the software of the data processing system 22 as being attached to the femur and tibia respectively.
  • the software controls the infrared emissions from each marker via communication cables 18a, 20a and 42a associated with each marker.
  • the software can distinguish between the markers by turning them on one at a time.
  • Foot pedals 27 may be used to communicate interactively in response to the software to indicate that the markers are in place. With the markers 18 and 20 in position as shown in Figure 1, foot pedal 27 is pressed in response to a prompting command from the software displayed on the monitor 24 to indicate that the markers are in position and ready. The software then activates the markers 18 and 20 which emit infrared signals that are read by the cameras 14 and 16. The cameras identify the marker locations in space and transmit the information to the software which records their location and mathematically establishes coordinate reference frames 48 and 50 shown in Figure 3 for the femur and the tibia.
  • the position of the patella 52 is identified by palpating (touching) the patella with the tip 46 of pointer 44.
  • the movable marker 42 attached to pointer 44 is viewed by the cameras 14 and 16 and the position of the patella 52 is identified to the software and thus known relative to both the femur and tibia reference frames 48 and 50.
  • Marker 42 may be identified to the software interactively by holding the pointer 44 stationary with its tip 46 on the patella 52 and marker 42 visible to the cameras 14 and 16 and then pressing the foot pedal 27 in response to a prompting command requesting input of the patella location, the command being visible on the monitor 24.
  • the software activates the markers 18, 20 and 42 in sequence, their infrared emissions are viewed by the cameras 14 and 16 and the software is able to distinguish between the three markers and identify and record their relative locations upon receipt of the information from the cameras.
  • the femur articular point 54 may be determined by moving the femur 34 about the hip joint 56 as illustrated in dashed line in Figure 4 in response to a prompting command on the monitor 24.
  • Cameras 14 and 16 observe the motion of marker 18 and signal a number of discrete positions of the marker to the software.
  • the software calculates the positions of the patella 52 from the positions of marker 18 observed by the cameras during the femur motion.
  • the software knows that the positions the patella may take all lie on a sphere centered at the articular point of the hip joint.
  • the software can calculate the femur articular point 54 in the femur reference frame 48, the articular point 54 being a common point at the hip joint that has substantially the same distance to all of the positions of the patella 52.
  • the femoral axis 58 can be defined. As shown schematically in Figure 2, the femoral axis 58 is an imaginary line extending between the femur articular point 54 (i.e., the center of the hip joint) and the position of the patella 52 and is defined mathematically by the software.
  • the femoral axis 58 does not necessarily coincide with the femur 34 and is used in conjunction with the positions of the medial and lateral epicondyles 60 and 62 respectively, to determine an initial estimate of the knee articular point as described below.
  • the epicondyles are eminences that protrude from either side of the femur 34 above the knee joint 30.
  • the positions of the medial and lateral epicondyles 60 and 62 respectively are identified by palpating each with the tip 46 of pointer 44 and allowing the movable marker 42 to be observed by the cameras 14 and 16.
  • each epicondyle is palpated, its respective position is identified to the software, again conveniently by responding to interactive prompts on the monitor 24, the user positioning the pointer 44 appropriately in response to a command and pressing the pedal 27.
  • the software mathematically defines a plane 64 perpendicular to the femoral axis 58.
  • the plane 64 is located along the femoral axis where the plane is at substantially equal respective rectangular distances 66 and 68 to the positions of the medial and lateral epicondyles 60 and 62.
  • the point of intersection 70 between the plane 64 and the femoral axis 58 is the initial estimate of the knee articular point.
  • a region 72 in the plane 64 is defined that includes the estimate point.
  • the region 72 is a circle of 1cm diameter centered on the initial estimate point 70.
  • Region 72 contains candidate points for the knee articular point, one of which will be selected mathematically, preferably using statistical methods as described below.
  • the position of the articular point 74 of the tibia at the ankle joint 76 is determined with respect to the fixed marker 20, preferably using the positions of the medial and lateral malleoli 78 and 80.
  • the malleoli are the protuberances on either side of the ankle joint.
  • the positions of the medial and lateral malleoli 78 and 80 respectively are identified by palpating them with the tip 46 of the pointer 44 attached to the movable marker 42 when prompted by the software.
  • the marker 42 is observed by the cameras 14 and 16 which signals the respective positional information of the malleoli to the software.
  • Actuation of foot pedal 27 may be used to effect data capture as with previous palpations.
  • an anterior point 82 of the ankle joint 76 is identified by palpating the anterior region of the ankle in the sagittal plane of the tibia 38. Knowing the positions of the malleoli 78 and 80, the software mathematically defines an imaginary line 84 (see Figure 2) between the medial and lateral malleoli 78 and 80. Knowing the position of anterior point 82, the software then mathematically projects another line 86 from the anterior point 82 that intersects line 84 substantially perpendicularly. The point 74 where lines 84 and 86 intersect is defined as the tibia articular point.
  • the tibia 38 is next rotated about the knee joint 30 through a specified range of motion.
  • the tibia 38 is initially placed at a substantially right angle to the femur 34 and then rotated in flexure (away from the femur), as shown in dashed line, through an angle between about 10° and about 90°, but preferably between about 10° and about 40°.
  • Moving the tibia moves the tibia articular point 74 through a trajectory 88 relative to the knee joint 30, the motion being constrained by the nature of the knee joint, which may be approximated as a hinge for angular motion between about 10° and about 40°, and the fact that the articular point is at the end of a rigid body (the tibia 38) movable about the hinge joint (the knee 30).
  • Cameras 14 and 16 observe the motion of marker 20 on the tibia 38 relative to the marker 18 on the femur 34 and signal the positions of a multiplicity of points of the marker 20 to the software.
  • the software knows the position of the tibia articular point 74 in the tibia reference frame 50 (i.e., relatively to the marker 20) for all motions of the tibia. Using this information, the software can calculate the corresponding motion of the articular point 74 relative to the points within the region 72 (fixed in the femur reference frame 48 as shown in Figure 2) through the trajectory 88 defined by the constraints of a rigid body (the tibia 38) rotating about a hinge joint (the knee joint 30) relative to another rigid body (the femur 34).
  • the software uses the positional information of the tibia articular point 74 during its motion through trajectory 88 to choose a point from among the points in the region 72 (see Figure 2) which represents the best estimate of the position of the knee articular point 90 based upon a particular set of criteria.
  • the point within region 72 having a position that is substantially invariant for a multiplicity of positions of the tibia articular point along its trajectory 88 about the knee joint 30 is selected as the knee center or knee articular point 90.
  • the point in region 72 that has the smallest standard deviation of distance to the tibia articular point 74 for a multiplicity of positions of the tibia articular point 74 along the trajectory 88 may be selected as the knee articular point or knee center 90.
  • the accuracy with which the position of the knee articular point 90 is determined will be proportional to both the number of positions of the tibia articular point 74 that are measured along the trajectory 88 and the number of points in the region 72 each of these points is compared with. Generally, the more points used the greater the accuracy of the answer. Natural physical limits on the ability of the cameras to accurately measure small differences in position, as well as the accumulation of numerical errors within the mathematical algorithms used by the software will of course limit the accuracy of the answer.
  • the method of determining the articular point of a joint provides a fast procedure for acquiring accurate preoperative information respecting the position of a joint center which does not require surgery and, thus, enables the surgeon to avoid inflicting unnecessary trauma on a patient.

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Claims (18)

  1. Procédé pour déterminer la position d'un point articulaire (90) d'une articulation centrale (30) entre deux corps sensiblement rigides (34, 38), l'articulation centrale étant située entre des première et seconde articulations externes (56, 76) situées au niveau des extrémités desdits premier et second corps rigides (34, 38) distales par rapport à ladite articulation centrale, respectivement, ledit procédé comprenant les étapes consistant à :
    identifier la position d'un premier point (52) sur ledit premier corps rigide (34) situé sensiblement au niveau de ladite articulation centrale ;
    déterminer la position d'un premier point articulaire (54) dudit premier corps rigide au niveau de ladite première articulation externe (56) ;
    définir un premier axe (58) entre ledit premier point articulaire (54) et ledit premier point (52) ;
    identifier les positions respectives d'un second et d'un troisième point (60, 62) sur ledit premier corps rigide sur les côtés opposés de ladite articulation centrale ;
    définir un plan (64) sensiblement perpendiculaire audit premier axe (58) et à des distances rectangulaires respectives sensiblement égales par rapport auxdits second et troisième points (60, 62), l'intersection (70) dudit plan (64) et dudit premier axe (58) étant une estimation initiale dudit point articulaire (90) de ladite articulation centrale (30) ;
    déterminer la position d'un second point articulaire (74) dudit second corps rigide (38) au niveau de ladite seconde articulation externe (76) ;
    définir une région (72) dans ledit plan (64) ayant une taille prédéterminée, ladite région comprenant ladite estimation initiale (70) dudit point articulaire (90) de ladite articulation centrale (30) ;
    déplacer ledit second point articulaire (74) par rapport audit premier corps rigide (34) en faisant tourner ledit second corps rigide (38) autour de ladite articulation centrale (30) ;
    identifier une multiplicité de différentes positions dudit second point articulaire (74) pendant ladite rotation dudit second corps rigide (38) ; et
    déterminer un point parmi une multiplicité de points dans ladite région (72) pour lequel la position est sensiblement invariable pour chacune desdites positions dudit second point articulaire (74), ledit un point étant ledit point articulaire (90) de ladite articulation centrale (30).
  2. Procédé selon la revendication 1, dans lequel ladite étape consistant à déterminer la position d'un premier point articulaire (54) comprend les étapes consistant à :
    déplacer ledit premier point (52) en faisant tourner ledit premier corps rigide (34) autour de ladite première articulation externe (56) ;
    identifier une pluralité de positions dudit premier point (52) pendant le mouvement dudit premier point autour de ladite première articulation externe ; et
    déterminer mathématiquement un point commun au niveau de ladite première articulation externe (56) ayant sensiblement la même distance par rapport à toutes les positions desdites positions dudit premier point, ledit point commun étant ledit premier point articulaire (54).
  3. Procédé selon la revendication 1, dans lequel ladite étape consistant à déterminer la position dudit second point articulaire (74) comprend les étapes consistant à :
    identifier les positions respectives d'un quatrième et d'un cinquième point (78, 80) sur les côtés opposés de ladite seconde articulation externe (76) ;
    définir une première ligne (84) entre lesdits quatrième et cinquième points ;
    identifier la position d'un sixième point situé dans un plan sensiblement perpendiculaire à ladite première ligne (84) et à peu près à égale distance desdits quatrième et cinquième points ; et
    projeter une seconde ligne (86) à partir dudit sixième point pour couper ladite première ligne (84) au niveau d'un point d'intersection, ladite seconde ligne étant sensiblement perpendiculaire à ladite première ligne, ledit point d'intersection étant ledit second point articulaire (74).
  4. Procédé selon la revendication 1, dans lequel ledit point sensiblement invariable (90) est défini par un point dans ladite région (72) ayant le plus petit écart standard de distance entre ledit point et ledit second point articulaire (74) pour toutes les positions desdites positions dudit second point articulaire.
  5. Procédé selon la revendication 1, dans lequel ladite étape consistant à déplacer ledit second point articulaire (74) comprend l'étape consistant à orienter initialement ledit second corps rigide (38) selon un angle sensiblement droit par rapport audit premier corps rigide (34) et faire tourner ledit second corps rigide autour de ladite articulation centrale (30) sur un angle compris entre environ 10° et environ 90° par rapport audit premier corps rigide.
  6. Procédé selon la revendication 5, dans lequel ledit second corps rigide (38) est entraîné en rotation sur un angle compris entre environ 10° et environ 40°.
  7. Procédé selon la revendication 1, dans lequel ladite région (72) comprend un cercle centré sur ladite estimation initiale dudit point articulaire (90) de ladite articulation centrale.
  8. Procédé pour déterminer la position d'un point articulaire (90) pour une articulation de genou (30) entre le fémur (34) et le tibia (38), l'articulation de genou comprenant une rotule et des épicondyles médian et latéral (60, 62) et étant située entre une articulation de hanche (56) et une articulation de cheville (76) situées aux extrémités respectives dudit fémur et dudit tibia de manière distale par rapport à ladite articulation de genou, ledit procédé comprenant les étapes consistant à :
    identifier la position de ladite rotule (52) ;
    déterminer la position d'un point articulaire (54) dudit fémur au niveau de ladite articulation de hanche (56) ;
    définir un axe fémoral (58) s'étendant entre ledit point articulaire du fémur et ladite rotule ;
    identifier les positions desdits épicondyles médian et latéral ;
    définir un plan (64) sensiblement perpendiculaire audit axe fémoral et à des distances rectangulaires respectives sensiblement égales par rapport auxdites positions desdits épicondyles médian et latéral (60, 62), l'intersection dudit plan et dudit axe fémoral étant une estimation initiale dudit point articulaire de ladite articulation du genou ;
    définir une région (72) dans ledit plan ayant une taille prédéterminée, ladite région comprenant ladite estimation initiale (70) dudit point articulaire de ladite articulation de genou ;
    déterminer la position d'un point articulaire (74) dudit tibia au niveau de ladite articulation de cheville (76) ;
    déplacer ledit point articulaire du tibia (74) par rapport audit fémur en faisant tourner ledit tibia autour de ladite articulation de genou ;
    identifier une multiplicité de positions différentes dudit point articulaire du tibia (74) pendant ladite rotation dudit tibia ; et
    déterminer un point parmi une multiplicité de points dans ladite région pour lequel la position est sensiblement invariable pour chacune desdites positions dudit point articulaire du tibia, ledit point étant ledit point articulaire (90) de ladite articulation du genou (30).
  9. Procédé selon la revendication 8, dans lequel ladite étape consistant à déterminer la position dudit point articulaire du fémur (54) comprend les étapes consistant à :
    déplacer ladite rotule (52) en faisant tourner ledit fémur autour de ladite articulation de hanche (56) ;
    identifier une pluralité de positions de ladite rotule pendant le mouvement de ladite rotule autour de ladite articulation de hanche ; et
    déterminer mathématiquement un point commun au niveau de ladite articulation de hanche ayant sensiblement la même distance par rapport à toutes les positions desdites positions de ladite rotule, ledit point commun étant ledit point articulaire du fémur (54).
  10. Procédé selon la revendication 8, dans lequel ladite étape consistant à déterminer la position dudit point articulaire du tibia (74) au niveau de ladite cheville comprend les étapes consistant à :
    identifier les positions respectives des malléoles médiane et latérale (60, 62) sur les côtés opposés de ladite articulation du cheville (76) ;
    identifier la position d'un point antérieur de ladite cheville située dans un plan sagittal dudit tibia ;
    définir une première ligne (84) entre lesdites malléoles médiane et latérale; et
    projeter une seconde ligne (86) à partir dudit point antérieur pour couper ladite première ligne (84) au niveau d'un point d'intersection, ladite seconde ligne étant sensiblement perpendiculaire à ladite première ligne, ledit point d'intersection étant ledit point articulaire du tibia (74) .
  11. Procédé selon la revendication 8, dans lequel ledit point sensiblement invariable (90) est défini par un point dans ladite région (72) ayant le plus petit écart standard de distance entre ledit point et ledit point articulaire du tibia (74) pour toutes les positions desdites positions du point articulaire du tibia.
  12. Procédé selon la revendication 8, dans lequel ladite étape consistant à déplacer ledit point articulaire du tibia (74) comprend l'étape consistant à orienter initialement ledit tibia (38) selon un angle sensiblement droit par rapport audit fémur (34) et faire tourner ledit tibia autour de ladite articulation de genou (30) sur un angle d'extension compris entre environ 10° et environ 90° par rapport audit fémur.
  13. Procédé selon la revendication 12, dans lequel ledit tibia (38) est entraîné en rotation sur un angle compris entre environ 10° et environ 40°.
  14. Procédé selon la revendication 8, dans lequel ladite région (72) comprend un cercle de diamètre prédéterminé ayant ladite estimation initiale (70) dudit point articulaire (90) en tant que son centre.
  15. Procédé pour déterminer la position d'un point articulaire (90) d'une articulation de genou (30) entre le fémur (34) et le tibia (38) d'une jambe, l'articulation de genou comprenant une rotule (52) et des épicondyles médian et latéral (60, 62) et étant située entre une articulation de hanche (56) et une articulation de cheville (76) situées au niveau des extrémités respectives dudit fémur et dudit tibia de manière distale par rapport à ladite articulation de genou, ledit procédé comprenant les étapes consistant à :
    fixer un premier marqueur (18) sur une partie de ladite jambe comprenant ledit fémur (34) ;
    fixer un second marqueur (20) sur une partie de ladite jambe comprenant ledit tibia (38) ;
    identifier les positions desdits premier et second marqueurs (18, 20) dans l'espace en utilisant un dispositif de mesure (14, 16) ;
    palper ladite rotule (52) en utilisant un troisième marqueur (42) ;
    identifier la position de ladite rotule en utilisant ledit dispositif de mesure pour mesurer la position dudit troisième marqueur dans l'espace en utilisant ladite étape de palpation de la rotule ;
    déterminer la position d'un point articulaire de fémur (54) en utilisant un système de traitement de données (22) adapté pour recevoir des signaux correspondant à des données positionnelles des marqueurs provenant du dispositif de mesure ;
    définir mathématiquement un axe fémoral (58) s'étendant entre ledit point articulaire de fémur (54) et ladite rotule (52) en utilisant ledit système de traitement de données ;
    palper lesdits épicondyles médian et latéral (60, 62) en utilisant ledit troisième marqueur (42) ;
    identifier les positions desdits épicondyles en utilisant ledit dispositif de mesure pour mesurer la position dudit troisième marqueur dans l'espace pendant ladite étape de palpation des épicondyles ;
    définir mathématiquement, en utilisant ledit système de traitement de données, un plan (64) sensiblement perpendiculaire audit axe fémoral (58) et à des distances rectangulaires respectives sensiblement égales par rapport aux positions desdits épicondyles médian et latéral, l'intersection (70) dudit plan et ledit axe fémoral étant une estimation initiale dudit point articulaire de ladite articulation de genou (30) ;
    définir une région (72) dans ledit plan ayant une taille déterminée, ladite région comprenant ladite estimation initiale (70) dudit point articulaire de ladite articulation de genou ;
    déterminer la position d'un point articulaire (74) dudit tibia au niveau de ladite articulation de cheville (76) ;
    déplacer ledit point articulaire de tibia (74) par rapport audit fémur (34) en faisant tourner ledit tibia (38) autour de ladite articulation de genou (30) ;
    identifier une multiplicité de positions différentes dudit point articulaire de tibia (74) en utilisant ledit dispositif de mesure (14, 16) pour mesurer les positions desdits premier et second marqueurs (18, 20) pendant le mouvement dudit point articulaire de tibia (74) ; et
    déterminer mathématiquement, en utilisant ledit système de traitement de données (22), un point parmi une multiplicité de points dans ladite région (72) pour lequel la position est sensiblement invariable pour chacune desdites positions dudit point articulaire de tibia (74), ledit un point étant ledit point articulaire (90) de ladite articulation de genou.
  16. Procédé selon la revendication 15, dans lequel ladite étape consistant à déterminer la position dudit point articulaire de fémur (54) comprend les étapes consistant à :
    déplacer ladite rotule (52) en faisant tourner ledit fémur autour de ladite articulation de hanche (56) ;
    identifier une pluralité de positions de ladite rotule pendant le mouvement de ladite rotule autour de ladite articulation de hanche ; et
    déterminer mathématiquement un point commun au niveau de ladite articulation de hanche ayant sensiblement la même distance de toutes les positions desdites positions de ladite rotule, ledit point commun étant ledit point articulaire de fémur (54).
  17. Procédé selon la revendication 15, dans lequel l'étape consistant à déterminer la position d'un point articulaire dudit tibia au niveau de ladite articulation de cheville comprend les étapes consistant à :
    palper les malléoles médiane et latérale (78, 80) de ladite articulation de cheville (76) avec ledit troisième marqueur (42) ;
    identifier les positions respectives desdites malléoles en utilisant ledit dispositif de mesure (14, 16) pour mesurer la position dudit troisième marqueur dans l'espace pendant ladite palpation desdites malléoles ;
    palper un point antérieur (82) de ladite cheville dans le plan sagittal dudit tibia avec ledit troisième marqueur ;
    identifier la position dudit point antérieur (82) en utilisant ledit dispositif de mesure pour mesurer la position dudit troisième marqueur dans l'espace pendant ladite palpation dudit point antérieur ;
    définir mathématiquement, en utilisant ledit système de traitement de données, une première ligne (84) entre lesdites malléoles médiane et latérale ; et
    projeter mathématiquement, en utilisant ledit système de traitement de données, une seconde ligne (86) à partir dudit point antérieur pour couper ladite première ligne au niveau d'un point d'intersection, ladite seconde ligne étant sensiblement perpendiculaire à ladite première ligne, ledit point d'intersection étant ledit point articulaire de tibia (74).
  18. Procédé selon la revendication 15, dans lequel ledit point sensiblement invariable (90) est défini par un point dans ladite région (72) ayant le plus petit écart standard de distance entre ledit point et ledit point articulaire de tibia (74) pour toutes les positions desdites positions dudit point articulaire de tibia.
EP03767715A 2002-12-03 2003-12-01 Procede destine a determiner la position du point articulaire d'une articulation Expired - Lifetime EP1569554B1 (fr)

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US10/308,622 US7209776B2 (en) 2002-12-03 2002-12-03 Method of determining the position of the articular point of a joint
US308622 2002-12-03
PCT/EP2003/013486 WO2004049941A1 (fr) 2002-12-03 2003-12-01 Procede destine a determiner la position du point articulaire d'une articulation

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US20060282023A1 (en) 2006-12-14
ES2282684T3 (es) 2007-10-16
ATE355012T1 (de) 2006-03-15
JP4331113B2 (ja) 2009-09-16
DE60312210D1 (de) 2007-04-12
AU2003292163A1 (en) 2004-06-23
WO2004049941A1 (fr) 2004-06-17
DE60312210T2 (de) 2007-11-22
US7209776B2 (en) 2007-04-24
EP1569554A1 (fr) 2005-09-07
US7780677B2 (en) 2010-08-24
US20040106861A1 (en) 2004-06-03

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